R.3.13
Date Code 20111215 Reference Manual SEL-421 Relay
SELOGIC Control Equation Programming
SELOGIC Control Equation Elements
SELOGIC Control
Equation Variables
SELOGIC control equation variables are Boolean storage locations. Each
variable equals either logical 1 or logical 0. This manual refers to these
variables and the relay displays these as 1 and 0, respectively. Think also of
the states 1 and 0 as True and False when you evaluate Boolean logic
statements. The quantities of SEL
OGIC control equation variables available in
the different programming areas are listed in Table 3.9.
Use the SEL
OGIC control equation variables in free-form logic statements in
any order you want. Use a SEL
OGIC control equation variable more than once
in free-form logic programming, and use SEL
OGIC control equation variables
as arguments in SEL
OGIC control equations. Example 3.4 illustrates SELOGIC
control equation variable usage.
Table 3.6 First Execution Bit Operation on Power-Up
Name Description
AFRTEXA Relay sets on power-up and clears after each automation program-
ming block has been executed once.
AFRTEXP Relay sets on power-up. Relay clears after it enables protection and
all automation programming blocks have been executed once.
PFRTEX Relay sets on power up. Relay clears after protection runs for one
cycle.
Table 3.7 First Execution Bit Operation on Automation Settings Change
Name Description
AFRTEXA Relay sets on settings change and clears after each automation pro-
gramming block has been executed once.
AFRTEXP Relay sets on settings change. Relay clears after it enables protec-
tion and all automation programming blocks have been executed
once.
PFRTEX Relay sets on settings change. Relay clears after protection runs for
one cycle.
Table 3.8 First Execution Bit Operation on Protection Settings Change,
Group Switch, and Source Selection
Name Description
AFRTEXA Relay does not set.
AFRTEXP Relay sets when listed event occurs. Relay clears after it enables
protection and all automation programming blocks have been exe-
cuted once.
PFRTEX Relay sets when listed event occurs. Relay clears after protection
runs for one cycle.
Tabl e 3 . 9 S ELOGIC Control Equation Variable Quantities
Type Quantity Name Range
Protection SELOGIC control equation variables 64 PSV01–PSV64
Automation SEL
OGIC control equation variables 256 ASV001–ASV256
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